Replace ol.tilegrid.XYZ with an ol.tilegrid.createXYZ function

src/ol/source/xyzsource.js

@@ -3,7 +3,6 @@ goog.provide('ol.source.XYZ');
 goog.require('ol.Attribution');
 goog.require('ol.TileUrlFunction');
 goog.require('ol.source.TileImage');
-goog.require('ol.tilegrid.XYZ');
 
 
 
@@ -20,7 +19,7 @@ ol.source.XYZ = function(options) {
   var projection = goog.isDef(options.projection) ?
       options.projection : 'EPSG:3857';
 
-  var tileGrid = new ol.tilegrid.XYZ({
+  var tileGrid = ol.tilegrid.createXYZ({
     extent: ol.tilegrid.extentFromProjection(projection),
     maxZoom: options.maxZoom,
     tileSize: options.tileSize
@@ -42,7 +41,8 @@ ol.source.XYZ = function(options) {
    * @private
    * @type {ol.TileCoordTransformType}
    */
-  this.tileCoordTransform_ = tileGrid.createTileCoordTransform();
+  this.tileCoordTransform_ =
+      ol.tilegrid.createOriginTopLeftTileCoordTransform(tileGrid);
 
   if (goog.isDef(options.tileUrlFunction)) {
     this.setTileUrlFunction(options.tileUrlFunction);